Difference between revisions of "Mitsubishi OSE104 Serial Encoders"

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MC34051 RS-422 transceiver chip.
 
MC34051 RS-422 transceiver chip.
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 +
== Protocol ==
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 +
The encoder uses a full duplex RS-422 UART to connect to the host:
 +
 +
{| class="wikitable"
 +
! Baud Rate
 +
| 2,500,000
 +
|-
 +
! Data Bits
 +
| 8
 +
|-
 +
! Stop Bits
 +
| 1
 +
|-
 +
! Parity
 +
| none
 +
|}
 +
 +
For interacting with the encoder from a PC, a USB to serial supporting a higher than usual baudrate must be used. A convenient converter that also has native RS-422 support is a [[MaxLinear XR21B1420IL28-0A-EVB USB to RS-232/422/485 Evaluation Board]].
 +
 +
Requests from the host seem to be a single byte, and the response is multi-byte with a checksum. For recognized commands the response's first byte is the request byte echo'd back, and it seems for unrecognized commands it has a default response. Here is a list of known commands:
 +
 +
{| class="wikitable"
 +
! Request
 +
! Response Length
 +
! Description
 +
|-
 +
| 0x02
 +
| 7
 +
| angle only (no full revolutions)
 +
|-
 +
| 0x1A
 +
| 11
 +
|-
 +
| 0x2A
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| 9
 +
| same as 0xA2?
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|-
 +
| 0x32
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| 9
 +
| same as 0xA2?
 +
|-
 +
| 0x4A
 +
| 11
 +
|-
 +
| 0x52
 +
| 11
 +
|-
 +
| 0x62
 +
| 9
 +
|-
 +
| 0x7A
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| 3
 +
|-
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| 0x8A
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| 6
 +
| full revolutions only (no angle)
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|-
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| 0x92
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| 4
 +
|-
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| 0xA2
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| 9
 +
|-
 +
| 0xBA
 +
| 7
 +
|-
 +
| 0xC2
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| 11
 +
|-
 +
| 0xDA
 +
| 11
 +
|-
 +
| 0xEA
 +
| 9
 +
|-
 +
| 0xF2
 +
| 3
 +
|-
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| 0xF4
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| 3
 +
|}
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 +
Other possible commands are: <code>0x0A 0x22 0x3A 0x42 0x5A 0x6A 0x72 0x82 0x9A 0xAA 0xB2 0xCA 0xD2 0xE2 0xF3 0xF5-0xFF</code>
  
 
== Online Resources ==
 
== Online Resources ==

Revision as of 09:45, 10 January 2020

Overview

Proprietary serial encoders made by Mitsubishi meant to work with their MELDAS CNC controllers. It uses 2.5 Mbaud RS-422 to communicate with the controller. The protocol has been partially reverse engineered, and is supported by Rene Hopf's STMBL servo drive.

Specifications

Page 195 (III-58 in the PDF) of the BNP-C3000C(ENG) manual details the specifications for different variants.

Wiring Diagram

Wire Color Circular Pin Mini-D Pin Function
green N (shield) (case GND)
gray L 17 RQ-
orange K 7 RQ+
yellow J 16 SD-
red E 9 (battery)
blue H 6 SD+
black R 1,11 0V
white S 10,19,20 +5V

Bill of Materials

MC34051 RS-422 transceiver chip.

Protocol

The encoder uses a full duplex RS-422 UART to connect to the host:

Baud Rate 2,500,000
Data Bits 8
Stop Bits 1
Parity none

For interacting with the encoder from a PC, a USB to serial supporting a higher than usual baudrate must be used. A convenient converter that also has native RS-422 support is a MaxLinear XR21B1420IL28-0A-EVB USB to RS-232/422/485 Evaluation Board.

Requests from the host seem to be a single byte, and the response is multi-byte with a checksum. For recognized commands the response's first byte is the request byte echo'd back, and it seems for unrecognized commands it has a default response. Here is a list of known commands:

Request Response Length Description
0x02 7 angle only (no full revolutions)
0x1A 11
0x2A 9 same as 0xA2?
0x32 9 same as 0xA2?
0x4A 11
0x52 11
0x62 9
0x7A 3
0x8A 6 full revolutions only (no angle)
0x92 4
0xA2 9
0xBA 7
0xC2 11
0xDA 11
0xEA 9
0xF2 3
0xF4 3

Other possible commands are: 0x0A 0x22 0x3A 0x42 0x5A 0x6A 0x72 0x82 0x9A 0xAA 0xB2 0xCA 0xD2 0xE2 0xF3 0xF5-0xFF

Online Resources

Mitsubishi MELDAS MDS-C1 Series AC Servo/Spindle Specifications Manual

stmbl/encm.c at master · rene-dev/stmbl

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